Fatal error: Uncaught Error: Class "Whoops\Handler\Handler" not found in /home/demoweb/public_html/backworker/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php:16 Stack trace: #0 {main} thrown in /home/demoweb/public_html/backworker/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php on line 16